Star-based ultra-narrow field of view optical payload pointing correction method

By capturing images of the calibration star in orbit and calculating the pointing offset angle, and combining this with the cross-shaped search method to correct the pointing deviation of the ultra-narrow field-of-view optical payload, the pointing deviation problems caused by thermal deformation and installation errors were solved, thus improving the detector's search efficiency and accuracy.

CN117948987BActive Publication Date: 2026-07-14SHANGHAI AEROSPACE CONTROL TECH INST
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANGHAI AEROSPACE CONTROL TECH INST
Filing Date
2023-12-18
Publication Date
2026-07-14

AI Technical Summary

Technical Problem

In deep space exploration, the on-orbit pointing correction of ultra-narrow field-of-view optical payloads is subject to deviations caused by thermal deformation and installation errors, which affect the pointing accuracy and search efficiency of the detector.

Method used

By selecting a calibration star within the field of view, capturing its image, and calculating the pointing offset angle using the film constant method and the centripetal projection function, combined with the cross search method for correction, the pointing accuracy of the detector target center is improved.

Benefits of technology

It achieves efficient and accurate pointing correction for ultra-narrow field-of-view optical payloads, improving the efficiency and accuracy of the detector in searching for stellar targets, while reducing power consumption and cost.

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Abstract

The application provides a star-based super-narrow field optical load pointing correction method, which comprises the following steps: taking an image of a calibration star; calculating six constant values in a film constant method; calculating a target surface center coordinate of a detector target surface center in a celestial sphere center shooting plane; converting the target surface center coordinate in the celestial sphere center shooting plane into a celestial sphere coordinate of the detector target surface center; subtracting the target surface center coordinate in the celestial sphere coordinate system from a coordinate of the calibration star to obtain a pointing deviation angle; and using a cross search method on a target star to obtain a pixel image of the target star. The star-based super-narrow field optical load pointing correction method is based on the image of the calibration star, the target surface center coordinate of the detector target surface center is calculated, and the target surface center coordinate of the detector target surface center is subtracted from the coordinate of the calibration star to obtain the pointing deviation angle.
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